A source told Bob Kravitz of IndyStar.com that the 7-foot Indiana University sophomore will make it official at a 4:10 p.m. news conference at Assembly Hall.

The decision comes less than 24 hours after IU junior guard Victor Oladipo announced his decision to enter the draft.

Neither decision was a surprise. Both players are considered probable NBA lottery picks. But while Oladipo’s stock appeared to soar in recent months, Zeller’s play at times raised questions about whether he’s physically ready to compete in the NBA.